I extracted nodes from polygon parcel layer by Geometry Tools > Extract Nodes. However there are many crossed unnecessary points with same location after extracted nodes. There is a topic like this: Join attributes by location

Do you need the attributes of each overlapped point? Otherwise, you could use the Delete duplicate geometries to remove all points at the same location (this will leave you with the last point in your attribute table).
– JosephJul 23 '15 at 10:24

The answer posted by @gcarrillo here is a good method if you need the individual attributes.
– JosephJul 23 '15 at 10:59

Thanks. I will try those methods. Attribute info is not important, just x,y is important for this.
– Edip AhmetJul 23 '15 at 12:18